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Explorer
Explorer
478 Views
Registered: ‎10-12-2018

Which transceiver properties can opens the eye?

Hi,

I have a multi-Gig serial lane which goes through poor PCB. (So IBERT's eye is not so good) I want to collect all transceiver properties (both TX and RX) which effects directly on the eye. I guess almost all PMA properties, but which are these? Here is the menu of IBERT to choose parameters:

image.png

I mean: There are several transceiver settings, which appears in IBERT menu, however most of them are above PMA (Ex.: 8B/10B enabling does not affect the eye)

I found the following ones:

TX: TXDIFFSWING, TXPRE, TXPOST, TXPOSTCURSORINV, TXPRECURSORINV

RX: RXTERM, RX_DFE_CTLE_STAGE*, RX_DFE_GAIN_CFG, RX_DFE_*_CFG

Are these parameters worst to sweep? Are there any further?

 

 

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Teacher
Teacher
465 Views
Registered: ‎07-09-2009

Re: Which transceiver properties can opens the eye?

can you post a picture of the eye ?

 

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Xilinx Employee
Xilinx Employee
402 Views
Registered: ‎06-01-2017

Re: Which transceiver properties can opens the eye?

Please post the eye diagram.

Have you tried adjusting the TX parameters in the IBERT, e.g. TXDIFFCTRL, TXPRECURSOR, TXPOSTCURSOR?

What is your channel insertion loss?

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